劍經 Sword Treatise, is an ancient Chinese martial arts manual of deep fighting concepts written by Ming Dynasty General 俞大猷 Yu Da-You. Documented in it is 7 ways to defeat a straight attack. Below is the actual verse itself.

破直殺有七 – There are 7 ways to defeat a straight attack.一步閃腰打 – 1 way to use hip/waist strength to strike.二步折腳 – 2 ways to step diagonally (left/right)二步滾 – 2 ways to Roll (left/right)二步流水 - 2 ways to use the “Flowing-Water Stance” (left/right)

To Roll, is to use the lower portion of your weapon to ride along the enemy’s weapon, to go in for the kill.
“Flowing-Water Stance”, is to slant your weapon so that the enemy’s attack can ‘flow’ off.
Below is an example of “Flowing-Water Stance”.

I applied this documented ancient fight application to the Chinese Long-Saber against an incoming Spear‘s straight thrust.
Below is the video:

I hope you’ll find the video and interpretation helpful to your martial arts training.
The full Sword Treatise is coming up soon!

Special thanks to LL for helping me to interpret Sword Treatise!
Without him, the interpretation would have been impossible! =)